In a thread on Capcom Unity, Christian "Sven" Svensson confirmed that a new wave of PSOne (PSX, PS1) games are coming to the PlayStation Network's "PSOne Classics" collection. While he couldn't confirm which ones are coming, he details that these are only the first and not the last Capcom games that will reach the online store. Spencer on Siliconera compiled a list of PSOne games Capcom published in America and were subsequently rated by the ESRB. Here's an edited version with any Mega Man references.
Marvel vs. Capcom Mega Man 8 Mega Man Battle and Chase (Ok, this one isn't really a US release) Mega Man Legends Mega Man Legends 2 Mega Man X4 Mega Man X5 Mega Man X6 The Misadventures of Tron Bonne
One can only hope that at least one of those games is part of Capcom's upcoming classics.