Yesterday, the devs had a stream of WoWS dedicated to the new patch. In it, they said that they are actively preparing for the start of the general test, which we can expect very soon. And moreover, only one wipe will exist – from CBT to OBT. No wipe will be applied from the OBT to the full release!
We can expect the OBT in the fall (bummer). My guess is mid-summer.