There's a small section devoted to Xbox Live Arcade in the latest issue of Konami's newsletter -- creatively titled, "Konami News". In the newsletter, Konami announces that both Contra and Gyruss are coming "soon."
The article contains some previously unreleased info on both games. Contra will feature updated graphics and sounds, online multiplayer (!), and leaderboards. But does it have "the code?!" That's all we want to know. Gyruss will feature updated graphics, new versus and co-op modes, and leaderboards.