This is probably of great interest to a small number of people, and almost no interest to everyone else. Big Finish have acquired the rights to Blake's 7:
http://www.bigfinish.com/news/ (scroll down a couple of entries).
It specifies that it will star the original actors, which implies it's set in the original continuity, but no further details. I hope "original actors" simply means that it's the people from the original show, and not the actual season one original lineup, since I liked the last couple of seasons much more.
Apparently there will be quarterly releases, alternating between hardback novels and audio adventure box sets of three adventure mini-seasons. That is, two novels and two box sets each year, spaced out for one Blake's 7 release per quarter. That seems about right. Any less, and the franchise can't gain any momentum. Any more, and I think they'd be grossly overestimating the current audience.
For those unfamiliar with Big Finish, they've been producing Doctor Who audios for over a decade set during the first 8 Doctors runs, and featuring spinoffs of characters from the early years, and from other secondary media. They haven't had a 100% hit rate, but they've been pretty consistently more good than bad, and they've done a good job of trying new and interesting things instead of just the same stale media tie-in stories we've been trained to expect. This is good news for the Blake's 7 franchise, because hopefully they'll be able to build new and interesting things within the series' framework, instead of a series of random, unimportant adventures that just happen to slot between episodes of the original show.
The two-year gap between seasons two and three, in which the characters were instrumental in the off-screen intergalactic war, has got to be pretty tempting to Big Finish.
