Had the maximum 70(I think) players at my prerelease, and it was four rounds of fun. Our entire top 8 played 3+ color decks, and I believe all of them(at least 6) used blue. This doesn't mean blue is the best color in the format, but splashing for it is quite easy with all the mana fixers and the utility it adds is unmatched. I personally played a bant deck, mainly Selesnya splashing blue for some needed control elements, and I finished 4th. Funnest prerelease I've played in ever, and I'm really looking forward to drafting this set. What are your first impressions at your first prerelease of RtR? Any changes on your opinions of certain power levels or cards that suddenly stand out?