It seems they are not keeping a list of people interested in the next batch.

Just keep an eye on the forum and their website i guess, I also wrote a mail for batch 1 and was not even lucky to get in batch 2 where extra positions got open again at a certain time.
They were not filled with people waiting but were filled with people responding at the moment of writing here on the forum.

Correct me if i am wrong Blockhunter, this is what I experienced.

Happy Mining everyone !

PS: if you do keep a list Blockhunter please check if I am on it