In the past, we always said that we'd immediately dump whatever we were currently reviewing in favor of requests. However, that was before we started having a firm plan for our reviews a month or more in advance. In light of that, from here on out, review requests will be done in a timely manner, but will not NECESSARILY knock our schedule out of whack. Mainly, I'm covering my butt so we don't have to mess with April's Mecha Month.
However, on the flip side: in the past, we've also said to shoot for the obscure. However, go ahead and request your heart out. Even if we have prior exposure, we'll give it a shot.