The Kickstarter update seemed pretty specific. If they haven't received your return back by today, no refunds or replacements will happen. It's one of the worst aspects of today's news.
Edit: also, they seemed to imply that any pending orders will not ship and will be refunded:
"Orders from pebble.com are no longer being accepted or fulfilled, including Pebble 2 pre-orders, which have not yet been charged or shipped."
2nd Edit: Maybe I'm mis-reading the statement. Here's the actual text. You can figure out exactly what they mean by this:
"Returns of pebble.com orders that were successfully completed before December 7, 2016 will be refunded by our Support Team."
are they referring to ORDERS that were completed or RETURNS that were completed by December 7th? No clue...