[Q] android 4.3 instead of 5.0?

I heard rumors that google is still not working on Android 5.0 'key Lime Pie', and they will also not present it on Google I/O this month.
Apparently they will release a newer version of a Jelly bean ROM, Android 4.3, apperently with codename 'Android 4.3 JWR23B'.
Rumors told me that Google already tested Android 4.3 on a galaxy nexus 7 and nexus 4.

What my question is:
The Samsung galaxy tab10.1 had a timid start with android 4.2, it was laggy and it didn't respond at times, but it turned out to be one of the fastest ROM ever on my galaxy tab10.1 after hard and long work ( i'm flashing pershoot's ROM's (CyanogenMod) now since 11 months), thanks to pershoot.
Will there also be any chance to run a newer android version on this tablet after Android 4.2?
since there were doubts that android 4.2 would ever work on this tablet and turned out to be this smooth, it's giving me alot hope, what do you think?
-what do you think, android 4.3 or 5.0?
-what could be new in android 4.3/5.0?

Let me know!