I never saw Rotom as a Legendary and I don't why anyone would think he is. IMO, I just think he's one of the few Pokés who's a little bit harder to get than the average Pokémon. Much like Spiritomb or Zorua. Much like Zorua/Zoroark he has this specific thing not any other Pokémon has. However that does not make him a Legendary by any means. Just a little bit more special.
Also looking for conformation on whether he is or isn't a legendary is pretty stupid. A Pokémon is legendary when TPCi says so. They don't have to say for any Pokémon whether they're a legendary or not.
On another more on topic note, I'd like to give the EX and shiny guessing a try:
Lugia EX
Virizion EX; My guess is that they will try to do the B&W Legendaries first.
Thundurus EX; As said B&W Legendaries first.
Suicune EX; Last of the dog trio.
Shinies:
Samurott Ability
Eviolite
I think those will definitely be in there.
Other possiblities might be:
Meloetta EX; Cobalion EX; Genesect EX maybe bring in the other Legendary birds?
Shiny Charchomp, Shiny Ninetales, Shiny Vileplume, Shiny Sigiliph.
Also looking for conformation on whether he is or isn't a legendary is pretty stupid. A Pokémon is legendary when TPCi says so. They don't have to say for any Pokémon whether they're a legendary or not.
On another more on topic note, I'd like to give the EX and shiny guessing a try:
Lugia EX
Virizion EX; My guess is that they will try to do the B&W Legendaries first.
Thundurus EX; As said B&W Legendaries first.
Suicune EX; Last of the dog trio.
Shinies:
Samurott Ability
Eviolite
I think those will definitely be in there.
Other possiblities might be:
Meloetta EX; Cobalion EX; Genesect EX maybe bring in the other Legendary birds?
Shiny Charchomp, Shiny Ninetales, Shiny Vileplume, Shiny Sigiliph.