One of the most wanted hypothetical Metal Gear games among fans is a remake of the original two games, which came out on the MSX. The games were released in 1987 and 1990, and take place in 1995 and 1999. They are about Solid Snake infiltrating Outer Heaven and defeating Big Boss.
In his recent Q&A session that took place in Washington DC the day before the GameFest interview, Kojima was asked by journalists wether he has plans to revisit these classic games, now that the series celebrates its 25th anniversary. However, it doesn't seem that Kojima is planning to remake the games at this point.