Not for a good while, if at all. Pebble 2 watches only support Bluetooth LE (low energy) connections, which works very differently. The LE functionality has been there since the first Pebble watches, but the 2 is the first one to drop the traditional Bluetooth.

BT LE isn't currently supported on Sailfish, though the upcoming Bluez5 and a later update to QtConnectivity 5.6 should help with that. The main problem is that Pebble wrote their own communication protocol for their LE support, which they call PPoGATT. Katharine wasn't allowed to release documentation on that, so it'll be a reverse engineering job. An android app called GadgetBridge has made inroads there, but it's very messy and will never be as good as a proper implementation.

Previously, I would have said it'll come but not for a while. But now I'm not sure if the interest in the residual Pebble ecosystem will be long lived enough.