- The new OS prevents the calculators from being downgraded
- The OS prevents running Asm/C programs, only Basic (and on some editions Python) programs are allowed
- Applications can still be installed if signed by approved TI vendors
Sounds like the TI homebrew community is about to get splintered. You'll have the jailbreakers fighting for code execution, but this could easily end up a small underground operation mirroring other jailbreak efforts. It could become too much of a hassle to get asm programs back (custom OS?), if so most people will accept the limitations and move on. At least there's still Basic and Python, if nothing else.
The last update for the TI-84 Plus CE came out about 11 months ago. Its not recent, but it wasn't ages ago.