I purchased Planetary Annihilation on steam way back on the 15th of June, 2013. I have yet to receive any rewards in game at all besides my Alpha and Beta badges but nothing other than that. This being such an early purchase and without rewards for my $90 USD Purchase, I was curious if this has created the legibility of receiving the Planetary Annihilation: Titans complimentary in terms of the time of the purchase or compensation due to the rewards or lack thereof.
I believe it is just the commanders reward-wise. There aren't many convenient information sources that show the groupings of commander rewards as they seemed to shuffle around a bit and some were added in if you brought your licence before certain dates. I believe I am missing the Alpha and Delta Commanders. I haven't received the Theta Commander, either which I believe was available in some of the first version and was therefore transferred onto the further Bundles/Tiers. I'm not so sure about the progenitor Commander but that might of been available to myself as well.
You might want to contact Uber Support directly about that. They can take a look at your account data and see if anything is wrong. Either mail them at support@uberent.com or create a ticket here: http://support.uberent.com/ Though they are very busy at the moment of course with the sudden surge in support requests that comes with releasing a new game.