Mac Otakara says the 11-inch MacBook Air will be discontinued, the 13-incher will remain, and a 15-inch model will debut. All of the Airs and Pros are rumored to sport Thunderbolt 3/USB-C ports and ditch all USB-A, MagSafe, and Thunderbolt 2 ports.
Chances that this rumor is true (IMHO): 60%. I do think that we’ll see new MacBook Pros announced, though I think that won’t happen until August or September (although I’ll be happy to be proven wrong). However, I think Apple will ditch the Air moniker entirely and simply offer MacBooks in 12-inch and 14-inch versions.