How far backed up are class dates?

I interviewed back in late February and was offered a FO job. At the time of the interview I had around 1100 hours and gave them a tentative date of availability of July 15th. After receiving a call from them a week after the interview stating that I passed the captains review board they told me that I would be receiving additional emails with information on class dates. However, after not hearing anything all through March and April I decided to call them and ask about choosing a class date at which point they told me that classes are filled through August 27th and that I am in a class pool.

So, I guess my question becomes then when will I be taken out of the "class pool" and assigned an official class date? Hoping that I don't hit my 1500hrs in mid July just to be told no classes are available until the end of October.