They are making them cheaper to encourage sales. Now, how cheap is the question. We will see in a few days though.
Here's a link to those interested in what the speeders look like. These are the ones they are removing.
CTRL+F search on here.
www.hotrodacc.com/swtor/speeder.html
Korrealis Sovereign
Korrealis Prince
Korrealis Baron
Korrealis Commander
Tirsa Prime