We will be upgrading FogBugz On Demand to version 8.12.110 on Thursday, February 26th. We'll start upgrading small segments of customers at 0800 EST, and it should be rolled out to all accounts by 1700 EST. You shouldn't see an impact while this is happening.
After your account has been upgraded, at your next local midnight, your account's database will receive a schema upgrade. You may see a service interruption of up to 5 minutes when this occurs.