That would be good if was the case. Regardless, expect fairly rapid respawns on the starter and capital worlds to cope with the heavy load. As you progress further it should be a bit more even. Although some interactive quest objects and resource nodes could do with a respawn tweak.
As far as mobs themselves go, the last few patch notes during beta detailed a rebalance of some areas, increasing health and diversifying tactics (the latter of which I have noticed playing through areas I last saw back in October). I would assume base respawn rates would be adjusted as part of this rebalance.