Unfortunately, it is closed; Paypal pledging was shut down shortly after the Kickstarter ended.
With D:OS, the start of the beta corresponded with the release on Steam Early Access. If that is done again for D:OS 2, the timing would likely be the same (the alpha/beta starting in the latter half of this year). GOG has a similar 'Games In Development' feature now, so D:OS 2 could potentially be made available there, as well, depending on the details.
