Listed below is a post by Jason of Lipsey's providing details of the 2015 #1 lineup.
http://rugerforum.com/phpBB3/viewtopic.php?f=4&t=216537"Ok guys here is what I know for sure:
1A blue & walnut 22" 7mm-08
1S blue & walnut 24" 30-06
1B blue & walnut 28" 257 Weatherby Mag
1H blue & walnut 24" 375 H&H Mag
K1V stainless & walnut 26" 223 Rem 1 in 8" twist
Waiting for final spec on the RSI but either way you guys will be happy".