That would be a shame, because with the minor rules amendments in the supplement it fixes a lot of problems and aircraft power is the big one. Plus all the ships are errata'd that need it and some of the balance problems are ironed out. Some fleets that are crappy at high engagement levels ie the French, get sorted out.
Given the desirability of Battle level WWI and 20s dreadnoughts and superdreadnoughts even before the supplement comes out (would you ever not take a QE class as the British? And New Yorks are an excellent battle level choice, as is the Nagato), I anticipate a lot of fleets built around a battle level BB. I'm even tempted to take a French fleet so I can field the comedy fleet and include a Surcouf. But without OOB and the additions and erratas in there then I wouldn't because the French wouldn't standa a chance.