makapal nga ang rumors that it's FVR behind these hehe.
but i sincerely doubt this is all the opposition's plan. i think the reason why the "opposition" released these tapes "only now" is simple: they never had it. i believe that the tapes (which i believe are genuine and really feature GMA and Garcillano. perhaps you may ask why GMA herself would talk about such a sensitive matter on the phone? well, she has a reputation for micro-management) were hatched by someone from within the NBI. perhaps he sold it to the highest bidder. perhaps he's disgruntled with GMA. but the fact remains that the questions of the authenticity of the tapes and whether or not it was GMA are extremely critical.
why is GMA silent?
simple. if she denied it outright when the story of the tapes first broke, she'd be a sitting duck if the tapes were found to be authentic by a credible independent institution. plus, she was probably shocked to death that the "secret" tapes surfaced to the public, and her subordinates (particularly Bunye, who probably tried to pre-empt the opposition from pouncing on it by showing the two CDs on tv, and Gonzales, who's so dumb that he immediately shoots from the hip and orders the [illegal] arrest of even those who possess ringtones) panic for her defense.
if she confirmed that it was indeed her on the tape, then obviously, she's dead.
now that she kept her silence, she's dead too. if she denies it now, it will be impossible to believe. ano yun, she tried to remember first if she had that conversation? haha. she should already have known at the beginning if the conversation happened or not (syempre, it's either it did or it did not and she should know it on the spot which is true!).
i don't think it's right to blame the opposition for this. there's only GMA to blame. she kept her silence. the opposition is only asking questions as it always does. GMA's guilt is obvious in her response to the brewing scandal.