Mark Gatiss has written for both aforementioned shows so he’s in the same boat, and Sherlock fans know him as Mycroft aka Sherlock’s brother as well as a co-creator of the detective series.
Whether the series looks to stick to the traditional roots of the Dracula mythos or attempts to modernize an old tale like Sherlock remains to be seen.
The format of the series will for sure be the same as Sherlock, with each episode a feature length bit of a miniseries.
Steven Moffat, who has spent the past six seasons on Doctor Who, seems to have a talent for modernizing old properties and making them feel new again.