It's not rushing it, they just had a set budget for the speeches and probably decided to concentrate on a few factions and make them great and interesting, rather than make an equal amount of bland speeches for each faction.

Recording and putting speeches into the game is a pretty straightforward, if costly, business and I'd bet it was planned and done well before release. It's all the game balancing and fine-tuning that is done in the latter stages that usually either causes delays, or gets axed.

Sorry to sound like a fanboy, but your comment was just... wrong. My apologies to you if you are Turk and feel like your favourite faction has been wronged. I do hope the unpacked will allow you to record some new speeches and breathe more life into that faction.