So far, we're on target for a 15th June release. Last week 'Save/Load' was implemented. The file extension is called MTGX - a zipped file that contains the graph (in GraphML with Maltego extensions) and the entities - even custom entities. The file can also be used in the Entity import function. That means you can share you custom entities by simply sharing the file..
Before the end of the month we're looking for licensing and local transforms (v2). That means we get 1 week to sort out silly bugs and cosmetics and 1 week for packaging / documentation (BLEH) and getting the website ready.
Meanwhile we're also hard at work on the SQL TAS - idea is to have it ready with v3 around the 15th too. Exciting times!