I will be rebuilding Piworld PC from scratch, and i have some big plans this time different from what i had before, the major differences i will reveal now are that it will have multi-level maps and better art, also some of the storyline will be altered but that shouldnt really make a differences since i never publicly announced anything about the planned storyline anyway ;p

i will most likely make all the images, sounds, and music for piworld, (i plan on learning to compose music) but i will definetly keep that offer in mind, and for the screen size i am planning on going with fullscreen with the size being 1024x768 as suggested to me by acaceol, the screen size itself will be adjusted to whatever size your monitor is, but that will be the size it will be adjusting
also keep in mind that i am developing on linux now so windows builds will most likely be released a little bit later than linux builds (i do plan on keeping it compatible with both). I will not be supporting Mac however, because i do not have a Mac, and also because I do not like Macs :X

yeah, i wouldn't dream of ditching windows mainly because the majority of people use it, and I do have a study hall this quarter which gives me time to work on the calc version, however i have been working on a comic lately and probably will not work on it until the comic is finished, i have no idea how long that will take. :X
and yeah, i do not know as of now how resource intensive it will be but i will shoot for it being playable on as low of specs as possible

i probably will not because its hand drawn and my handwriting is fairly hard to read.
also i have finished my first model for a tile:

that is zoomed in a ways, and the actual tiles will of course have texture/color/imagery on them, not just plain old shades of grey

yes, i will make a sample map soon so you can see what it will be like

Sounds cool.  Good luck!

Builderboy: as of now i am still designing the map data structure, so it isnt finalized but the basic idea is that i store the hex tiles on a sprite sheet, and then when calling up map files it cheats and splits the hex tiles into squares, and uses a fairly normal map system, the only major difference is that the pointer to the location it needs to blit too is modified each height level. however because of the way the maps look (and are created) the map structure needs to be semi-complicated, one single tile needs to contain data for what sprite sheet to use, what hex to use, what tile within the hex to use, and the event the tile should have (like collision detection(collision detection will be line-of-sight based))
also i am proud to announce i have made my first online backup
it was kind of tricky to do as well, i decided to use freewebs to store my project files but freewebs does not allow any files other than "media". the way i got around this was by sticking my files in a pass protected zip (for security) and then shoving that onto the end of a jpg file with "cat file.jpg  file.zip > image.jpg" which allows me to now have any file type i want hackishly stored on freewebs

well its not really a change of extensions, more of a cross of extensions because of the way that jpg and zips are structured you can have a single file that is a valid image file and a valid archive file at the same time.
as for progress the only major update is i have finalized the hex, got the basic plan for the map system, and am ready to begin work on the main system.

EDIT: here i will attach an example