From CVG ( http://gtaforums.com...nfirmed-by-cvg/ ) we know that V will have about 70 missions plus 6 Main Heists.
Although we dont know how accurate this number is, we knew that V will have less than IV ( 94 missions ) for months.
So are you pleased with it?
I am pleased as long as there are a lot more activities and mini-games which we dont know about yet and I really want the individuel storyline for each protagonist to not be too short. When you play 40 Missions with all 3 guys, you have 10 Missions for each protagonist left, which ( imo ) would be too few. So I hope we have not too much Missions with all 3 Protagonists.
What we do know ( from the previews ) is that the Missions have alot more variety than IV and seem to be a bit longer.