From what I can tell from the pictures, it's the celt plastics + new metal additions + new command models. Re-worked versions of the old metal command models appear to have gone into the 'Germanic command' blister...
My first impression was 'Germans? - I get a more Celtic vibe from these'

But where the Romans divided Gauls and Germans at the Rhine, the two ethnic grops were probably much more intermingled. Having Germans with 'Roman' helmets, that are actually just a Gallic design adopted by the Romans could be seen as a little too much of a shortcut in making a new set of minis, and I think that just retaining the boar standards and the Carnyx for the command group is a tad lazy, but, again, there is probably no evidence against Germans using those, too.
So, all in all, it's a matter of personal taste, the models are nicely sculpted and probably good value.