I thought Test 15 = Alpha 2 = vaults from home. Trying to piece this together (been away for a while), but I’m drawing on these two quotes:
“Our current thinking is that once we have confirmed the stability of the soon to be launched Test 15 (some may have expected 12d), this will become Alpha 2. The Alpha 2 network will supersede all existing networks.”
—MaidSafe Dev Update - March 9, 2017
And …
“In Alpha 2 we’ll see support with Vaults from home and new routing.”
—[ANN] IPO of MaidSafe: Entering the Future of the Decentralized Internet