WordNet (r) 3.0 (2006):

upcoming
    adj 1: of the relatively near future; "the approaching
           election"; "this coming Thursday"; "the forthcoming
           holidays"; "the upcoming spring fashions" [syn:
           approaching, coming(a), forthcoming, upcoming]

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "upcoming":
   about to be, advancing, already in sight, anabatic, approaching,
   approximate, approximative, ascendant, ascending, ascensional,
   ascensive, at hand, attracted to, brewing, climbing, close,
   close at hand, coming, drawn to, foreseen, forthcoming, future,
   gathering, going to happen, immediate, imminent, impendent,
   impending, in danger imminent, in prospect, in reserve, in store,
   in the ascendant, in the cards, in the offing, in the wind,
   in view, instant, leaping, looming, lowering, lurking, menacing,
   mounting, near, near at hand, nearing, on the horizon, oncoming,
   overhanging, preparing, prospective, proximate, rampant, rearing,
   rising, saltatory, scandent, scansorial, skyrocketing, spiraling,
   springing, that will be, threatening, to come, uparching, upgoing,
   upgrade, uphill, uphillward, uprising, upsloping, upward, upwith,
   waiting