BA.com is saying they are "working on a reworked schedule" for the affected dates, and anyone affected by a cancellation, BA will contact you via e-mail or SMS.
I guess until the re-worked schdule is announced there will be no refunds.
Dosen't sound like they are planning on grounding the whole airline this time... watching those full flights take off from the picket line (out on the A30 somewhere) will be heartbreaking for some!
CB