Somewhat. The membrane approach has led some to postulate multiverses or parallel universes. Strictly speakng, brane theory is involved with branes confined to the universe of our existence, though some interactions may not be as obvious as light (for instance). String theory will likley prove to be somewhat the state of our reality, though perhaps not having 26 dimensions.
I found this recently. It's a flash presentation called "Imagining the Tenth Dimension". It describes 11 dimensions (numbered 0-10), and number ten seems to be the logical limit.