From the WSJ: RBS CEO's Exit Is Likely As Part of U.K. Purchase.

On Sunday night, bankers and officials expected to work through the night again to put in place details of the plan they hoped to announce before the market opens Monday.

...

On Sunday night, a spokesman for the London Stock Exchange said the market would be open for trading as usual.

The UK announcement is expected around 7 AM London Time (2 AM ET, 11 PM PT). We are still waiting for Morgan Stanley too.Here is the current London Time: Index Futures from Barchart.com (active futures have a time not a date)