I was watching Fox Sports, who have been advertising that they have the rights to the German Bundesliga for next season. Does this mean that it won't be on GMM, who had it last year ?

http://mobile.reuters.com/article/idUSBRE99D07220131014 seems like GMM lost the rights. Fox have a 5 year deal.

do most Thai cable Co's have FOX SPORTS with them ? Particularly Bangkok ?

Both CTH standard satellite package (Ch 47) and True Visions Gold Package (Ch 183 and 680) carries Fox Sports HD to give the channel it's correct name. I am no expert on city cable programming. I don't think CTH does a cable version, True might. Other cable packages possibly carry Fox Sports - I think its quite a cheap buy for the operators.

IPTV channels may be another source* - you'll have to do the Google legwork if noit enough info comes up here to meet your needs.

TOT IPTV does not carry Fox Sports HD.

Reruns of full Bundesliga games 2014/15 season are being shown already at the rate if 1 or 2 a day on Fox Sports HD