So the Green Tide formation was taken out of the Ghaz reprint? That's a shame since it was quite literally the only worthwhile thing for me in the original book. Suppose I should have seen it coming though, something useful for Orks, no that has to go.
For those unfamiliar, it is similar to the Apocalypse Formation (ref pg 140 Apocalypse 2012) except that the Waaagh called every turn would affect the entire Ork army, you loose the Follow Me Ladz rule, and the formation MUST be taken from the Ghaz sublist with the rules and caveats that apply (relics, and Ghaz special rules).
For friendly games I can totally see you getting away with using the old version or the Apoc formation. For more competitive games though you are a bit out of luck. From every tourney I've seen, not to mention more than a few more local competitive events the Apoc book is totally off the table, the reason cited is usually that the rules are set up for Apoc games and not games under 3000 pts.
In the end, the Green Tide was originally a misnomer for a Footslogger Ork Horde, and I suppose it will return to just a title. Not a big deal. But in the end its just one more kick we get from GW for playing something other then SMurfs.