Does anypony know if there is going to be an OSW ?
Unfortunately, there will no longer be any more OSWs until release. (At least, I'm 98% sure of this.)
However, there should be another wave of applications for the Limited Access Release (LAR) soon. This is for bug testing before the final release, which is a lot more in sight than it was before, but it's not exactly going to be "soon." I can't say much, but there's still a lot to work on.
If you want to help out and have fun while doing it, but can't actually work for LoE, then you should sign up for the next wave of the LAR.
When is this next wave? I don't really know. The only date I can get is "soon," which is as descriptive a word as when Aslan uses it in the Narnia series.
Still, it's something to look out for. Probably the same kind of waiting as when we used to wait for OSWs.
Oh, does that mean that LoE will be playable 27th - 29th?
Unfortunately, no. The full release still isn't for a while yet.
However, if you want to play the game, and help out at the same time, but can't work for LoE directly, there should be another wave of applications for the Limited Access Release coming "soon."
And no, I don't know when "soon" is, either.