I am sorry if this has already been reported, but today I was reading some posts on the nspire google group and I came across this:

http://groups.google.com/group/tinspire/browse_thread/thread/2346702796bbcf6e?hl=en

TI's website confirms these facts:

http://education.ti.com/educationportal/sites/US/homePage/nspire-software-os.html

Apparently, they are only adding three things, which are described on TI's page.  I hope they don't add any other things that block us from downgrading or running assembly programs.

EDIT--I included the wrong link in the original post.  Thanks DJ Omnimaga for pointing this out.

Haha, making an update just to have a slightly better slider!
They really have nothing else to do...

I sent and e-mail to TI asking if we would be able to downgrade our OS after upgrading.  I don't think the person who answered knew exactly what I was talking about since the referred to OS Version 2.0.1.60, but the response dosen't make me feel too good:

Thank you for contacting Texas Instruments.

This is a very good question you have about the TI-Nspire family handheld. The
latest version of the TI-Nspire family handheld operating system is OS 2.0.1.60.
And yes, if you upgrade to this version of the OS, you will not be able to
downgrade to a previous version.

Another resource you can use to find answers to your questions, example
calculations and other information is our Knowledge Base. The Knowledge Base is
accessible to you 24 hours a day, 7 days a week.

http://support.education.ti.com

I hope that you find this information helpful. If you have further questions or
comments, please feel free to send me an email.

Warmest Regards,

Doug Fincher

I was under the impression that we could downgrade with OS 2.0.1.60, but I never actually upgraded to it, so I could be wrong.  I really hope TI dosen't block downgrading as this could block all new Nspire users from using Ndless until (if) Ndless 2 is released.

Since it's possible to wipe out the OS from the diagnostics menu, I can't see how an effective downgrade prevention could be put in the OS itself
However, they could put such a highly unwanted (from users' POV, of course, but they don't care about us) protection in an update to the boot2. So far, it's been possible to screw with the .tno / .tnc files so as to remove the boot2 update from them... but perhaps they'll prevent the usage of modified .tno / .tnc files with future OS and boot2 versions...

Even if we can't upgrade our OS any more because of these reasons (prevent downgrade, new computer link needed) I really don't think I will never need to upgrade from 2.0.  The only thing that TI really can add at this point is 3d graphs (which would probably only be for the CAS) and more programming features (the only thing I could think of is dialog boxes, they would never add any features needed to make a graphical game).  Unless they add something really big, I really can't see my self upgrading.

Even if we can't upgrade our OS any more because of these reasons (prevent downgrade, new computer link needed) I really don't think I will never need to upgrade from 2.0.  The only thing that TI really can add at this point is 3d graphs (which would probably only be for the CAS) and more programming features (the only thing I could think of is dialog boxes, they would never add any features needed to make a graphical game).  Unless they add something really big, I really can't see my self upgrading.

We can always remove the boot2 upgrade from the package as well, assuming they included one.

Even if we can't upgrade our OS any more because of these reasons (prevent downgrade, new computer link needed) I really don't think I will never need to upgrade from 2.0.  The only thing that TI really can add at this point is 3d graphs (which would probably only be for the CAS) and more programming features (the only thing I could think of is dialog boxes, they would never add any features needed to make a graphical game).  Unless they add something really big, I really can't see my self upgrading.

Getkey. The 82 through 92+ and v200 got a getkey function and I believe the 73 and 76 do, too. I have no idea why they never added such function on Nspire models. It's clear they wanted to prevent game dev

If I was to upgrade, I would prefer 1.7 or 2.0. 2.0.1 for the OS 2.54 MP features on home screen, which I kinda enjoy (the ability to go back up and copy/paste stuff such as previous answers, altough it gets annoying when you typed a long line and want to move the char at the beginning, because it is no longer possible), so I don't need to deal with the screen issues