I'd heard that the release would be possibly Q2 next year, after the
DA Codex and possibly the new HE army book. As Darklighter says the rumours doing the rounds are that the experimental stuff will become standard issue, this was the way
GW were supposed to be going with the Tau which is why the rail rifle was an experimental weapon after the 3rd ed Codex was released (complete with gets hot rule) and became standard issue in the last Codex minus the gets hot rule. Admittedly this was before Matt "
Fluff Mangler" Ward got hold of
40K so this will probably change. Also there's a rumour that the smallest
FW Tau flyer (forget the name of it) will make it in to the main list along with some new auxillery units, heard that it would possibly be Squats.
"The guns have stopped because we are at last about to attack. Even our generals aren't mad enough to shell their own men, they think its far more sporting to let the Germans do it!"
Capt Edmund Blackadder, the Somme, 1917.