^^ Well we already know that HTV are no longer involved. Modern Video are doing season 4, and based on the Season 4 trailer, it looks like they're doing a pretty good job. If the Season 4 remaster is up to scratch then I imagine they'll get the nod for Season 6 as well.
The only issue with the S4 trailer is that the really good stuff being showcased is actually from Redemption part 2, which was done by CBS-D. It doesn't give a good feel for Modern videos work at all really.