You can allocate a new receiving address without waiting for the previous address to be included in the transaction chain.
For example, you need to receive assets from two different people and you have to share your receiving address with them. But for some reason you need to keep these addresses separately. In any other wallet you have to wait till the transaction is completed and only then you can get a new receiving address.
To proceed, just hit the "Get next" button on the “Receive coins” screen.