Originally Posted by
The_Judge_:
“Please hurry up Series 8
or can we have a minisode or two?”
They can't hurry up, unfortunately.

They won't be finished filming until late july, maybe early August. The next series is not going to be shown until September at the earliest.
I've read online, that Steven Moffat said a couple of months ago, that he wants the series to be shown in September, because the kids will have gone back to school after the 6 week holiday. That's when the viewing figures should be higher. It will be the start of the Autumn, and the colder weather will gradually be arriving, so not many people will be out on Saturday evenings. Plus, it will be darker earlier, too.
We should get the first 'teaser' trailer for the series, either in July, or in August. Then a proper trailer, after that, avout two weeks before broacast.
As for minisodes? Not sure about those at this stage, but I will keep looking online to see if there is going to be any.