Hardware....if you have original 4000T then just the casing, and LED indicator.
On Demand button (or via FP button) displays 'Top Picks' with user selectable options of:
On Demand, Recordings, On Now with sub section options as follows:
On Demand - Genres
Recordings - Recently added, Continue Watching
On Now - User can select 9 channels to display.
FP button - Options now listed at top of screen:
TV Guide, Players, Top Picks, Recordings, Media, Settings
Recordings - can now be viewed as Grid (tiles - as per 4000T) or a List.
Settings - On screen display transparency can be set on/off.
New style iplate accessible by pressing OK on remote.
Info on current live channel can be viewed in Guide without unit changing channel, by pressing OK button.
Search history - Up to 10 recent searches are saved.
All I can think of for now, more later if I have missed anything.