Here's the full timetable for folk who don't like following links:
Friday 30 April
09:00 to 09:30 - British F3 - Free Practice 1
09:40 to 11:00 - FIA GT1 World Championship - Free Practice
11:10 to 11:50 - GT4 European Cup - Free Practice 1
12:00 to 13:00 - FIA GT3 European Championship - Free Practice 1
13:00 to 14:00 - LUNCH
14:00 to 14:30 - British F3 - Free Practice 2
14:40 to 16:00 - FIA GT1 World Championship - Pre-Qualifying
16:10 to 16:50 - GT4 European Cup - Free Practice 2
17:00 to 18:00 - FIA GT3 European Championship
Saturday 1 May
09:00 to 09:50 - FIA GT3 European Championship - Qualifying
10:00 to 10:30 - British F3 - Qualifying
10:45 to 11:45 - FIA GT1 World Championship - Qualifying
11:55 to 12:30 - GT4 European Cup - Qualifying
12:30 to 13:15 - LUNCH
13:15 to 13:45 - Cooper Tires British F3 International Series - Race 1
14:14 to 15:15 - FIA GT3 European Championship - Race 1
15:45 to 16:25 - GT4 European Cup
17:15 to 18:15 - FIA GT1 World Championship - Qualifying Race
Sunday 2 May
09:30 to 10:00 - FIA GT1 World Championship - Warm Up
10:30 to 10:50 - Cooper Tires British F3 International Series - Race 2
10:55 to 11:10 - Church Break
11:00 to 11:30 - Pit Walk and Autograph Session
12:15 to 13:15 - FIA GT3 European Championship - Race 2
13:45 to 14:25 - GT4 European Cup - Race 2
15:15 to 16:15 - FIA GT1 World Championship - Championship Race
16:45 to 17:25 - Cooper Tires British F3 International Series - Race 3
The regular BF3 guys tested on the new Arena GP circuit the other week, so it will not be new to them, but it will be new to the three drivers from ART, so that may be interesting.
As far as I can see the timekeeping is not being done by by either MST or TSL, so it may be a struggle to get much more than results, i.e. Live Timing, but I will keep looking.