Haven't even seen them in Michigan yet. They seem to come out after the first few waves, but with Bell's plans to distribute 12 packs of cans, I wonder if they will even be released this year.
From their website it says mini-kegs will return later this summer. I wouldn't expect them for some time yet.
May at the earliest. They always come out later than bottles/kegs....I have one of each mini-keg going back to 2006