Maybe Adriweb, Critor or others could contact TI asking if they plan to release a new 68K calc or update them in the near future?
That said, I'm betting they'll say to go with the CX CAS instead. Seems things went that way with TI in terms of calc replacements
TI-81->82->83->83P->84P/Pocket
TI-83PSE->84PSE/Pocket SE->84PCSE
TI-80->73->73 Explorer
TI-85->86->89->89T->Nspire CAS->Nspire CAS Touchpad->Nspire CX CAS
And I am pretty sure that they initially planned to completely replace the 84+ line with the regular TI-Nspire, but then scrapped the idea.