Apple Watch pre-orders won't allow you to customize watch bands and cases
If you have a specific case and band combination that you want to pre-order for the Apple Watch starting on April 10 (when reservations will start being accepted), better move on to Plan B. According to a published report on Monday, Apple is limiting pre-orders to combinations of cases and bands already put together by Apple in pre-determined collections found online in the Apple Watch Store.
The Apple Watch is expected to launch on April 24th, and it appears that the officially sanctioned pairings of cases and bands will also carry over to the physical Apple Store as well. This could be simply a matter of Apple trying to make things as simple as possible for the first launch of its smartwatch. While it does make ordering the Apple Watch easier, and also helps streamline the process for Apple, it is being done at the customer's expense, literally.
source: AppleWatchStore, iMore via RedmondPie
Things that are NOT allowed: