Now that the proposed changes have been posted I'm happy with them. Overall the changes are decent buffs (nothing huge or overpowered) to all blockade runners.
The main points are:
All blockade runners will have two high slots (the Prowler is the only one with 2 highs now) to fit a probe launcher or covert cyno along with the covert cloak. This will be nice for non Prowler pilots flying in low and null.
The Prowler gets a third low. Agility, Mass and Align Time have been nerfed slightly. I'm not sure how that'll all work out in the end but hopefully if we slap a nano into the extra low we'll wind up with slightly better align times, making the net result a buff.
Cargohold increases for all blockade runners (some more than others). The Crane will have the largest base cargohold (4300 m3) and the Prorater the smallest (2900 m3) but the Crane also has the fewest low slots (2) and the Prorater the most (4). They'll all be able carry at least 10k m3 when fit for max cargo capacity.
The useless tanking bonus (is there anyone who actually uses shield boosters on a BR?) has been replaced with +5% warp speed per level. This is quite nice, finally there's a reason to train Transport Ships beyond 3 (or 4 for Prowler's with a Covert Cyno or Probe Launcher). At Transport Ships level 5 they'll go 7.5au/s (1.5 au/s more than now) which is a pretty decent buff.
Tanks are a little better with full T2 resists. This will be a small, but welcome buff.
And possibly most importantly, they DID NOT mess with the unscannable cargo hold like some players have been lobbying for. That would make me (with 25 Prowler pilots) one very unhappy camper.