New episode title(s) has/have been added to the database. Title: ロケット団VSプラズマ団！-前編-/Rocket-dan VS Plasma-dan! -zenpen-. Please comment below! Thanks, your friendly PM.Net AnimeBot

As BW17-BW20 aired yesterday in Taiwan, the next 4 episode block will air on June 24th. Best Wishes schedule on Chunghwa Telecom MOD (中華電信MOD) has been 4 episodes of the last Friday on the month, and http://www.pikatw.com/ states that BW21-24 (original numbering) which would include the two Rocket Gang episodes are scheduled to air. Korea should be getting pretty close to these episodes as well, so will see later on in June if these episodes premiere outside of Japan first or not.

What confirmation is there that the episodes are airing in October? Or is that a typo on the front page?

There is no confirmation which is why there is ?? in the air date. Our best guess from rumors is that it will air at that time.

Oh, I understand now. Thanks.~

And by "rumors" we generally just mean "a wild guess". All we know is "they will air", so we just make a guess, then switch it to a new guess when it becomes clear the old guess was wrong. It's just to keep those titles on the "upcoming episodes" list, really.

Since you didn't post anything about it, I take it the said episodes didn't air in Korea, right?

No both Korea and Taiwan skipped the episode airing. Korea seems to be following the English dub numbering scheme currently. As of the beginning of August 2011, it was only 4 episodes behind Japan and BW26 did air in Korea.