Dell began sending out Android 4.3 updates to it's budget Atom-based Android tablets late last year, but it's been a super-slow rollout. Well, now it's picking up steam. The OTA should be hitting both tablets soon, if not already.
This update bumps the Venue 7 and 8 to 4.3 from 4.2. Dell hasn't done a lot to tweak the operating system, so you're mostly getting the Google improvements in 4.3 (which were pretty light).