right now OG are out cos they don't have enough dpc points to reach the top 12 dpc ranking, but, as @batang_bitcoin said above, they'll participate in the TI western EU qualifiers. They need to win that to qualify automatically to TI
I don't think that they need the DPC points to qualify for The International since they are already the champion of the previous TI so they are automatically qualified, if they weren't qualified, they would have taken the DPC season seriously.