Each pairing will have 3 matches, with the winner of 2 of 3 moving on to the next round.  There will be 3 gamemodes used, baseq3 (standard q3), telefrag rails (from Eternal Arena), and full load (from Eternal Arena).  Each gamemode is assigned 3 maps, and one of these maps will be randomly chosen for each match.  In other words, you will play one match of BaseQ3 on one of it's three maps.  You will play one match of Full Load on one of it's three maps.  You will play one match of Telefrag Rails on one of it's three maps.

The TimeLimit for each match will be 12 minutes, and the FragLimit will be 35.

Here's the breakdown of the gamemodes and the maps (these can be downloaded individually or you can grab them all here):
 
 

Game Mode	Map 1	Map 2	Map 3
BaseQ3	pro-q3dm6	semper01q3	remorselessdm1
Full Load	q3dm17	maxx	unitooldm5
Telefrag Rails	q3dm16	ikdm2	alkdm2

You will be assigned an opponent, and a pairing sheet stating the order of the game modes and maps.

This will all be randomly generated.

More details and/or changes will be forthcoming.  ;-p