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). Touch response seems to have been cleaned up, and the camera focus and compression is a bit improved as well.
You can check the system update menu to see if the OTA is available to you yet. There are also some XDA threads with instructions for manual updating, but it's a bit of a runaround.