Looks slightly smaller than the Queen of Nanaimo / Burnaby which they're replacing.
Queen of Nanaimo : 192 Cars, 129.96m in length
New Builds : 145 Cars ( plus commercial trailers ), 107.4m length
They're likely a more efficient use of passenger space though, looks to have a little less outdoor deck space as well. The double-ended design should make for faster departures too, if anyone has travelled the Southern Gulf Islands route on the Queen of Nanaimo, the frequent stops require a lot of time consuming 'backing out' and maneuvering.
BC Ferries Website, Queen of Nanaimo Stats.