the new MacBook Pros might come in three variants: 12-inch, 13-inch and 15-inch.

Non-Retina MacBook Airs could be updated by the end of this month while the 12-inch Retina MacBook Air is expected to get a launch in mid-year.
http://www.newseveryday.com/articles/9099/20150218/macbook-pro-2015-release-date-rumors-update-magic-mouse-trackpad.htm