well thats hard to say but i would say most likely months as the blue, green, bronze, silver, obsessions, v2's, stocks all need to be regularly replenished so a new batch of orange (if there is to be one) will fit somewhere in with them and they have to be machined and plated before being shipped to chris for assembly and sale.
but the 1st batch was available beginning of december and the 2nd batch was april i think (not sure thoug) so a 3rd batch if there is one could very well be here before christmas but this is all speculation and guesswork so best advice would be to contact Chris (ReVoMaster) or Joseph (RevoGuy) and ask if and when they are expecting more stock of the orange.
Ex: Br V2 - O
LE: Ti (SE) 08-50 - O
CE Assembled: Bu - O, Gr - O, Br - O, Ag - O, Au - C, Ti - O
LE: Or - O, LM - O,
Obs: Bl V1 - O, Bl V2 - O, Bu Pro - O
R2 Voyager #88