Back in July, at Comic-Con 2013, Godzilla director Gareth Edwards revealed that this title creature will be doing battle with multiple monsters. Today, a leaked toy description from Urban Collector reveals one of the creatures is named MUTO and will be a gigantic spider with eight legs.
While the footage shown during the Hall H panel revealed a Kaiju creature with insect-like arms, we haven't heard anything else about any other additional monsters until now. MUTO is believed to be an homage to Kumonga, a massive spider-like creature that Toho Studios created for their 1967 film Son of Godzilla. Here's a description of Kumonga from Godzilla Wiki.
"According to the journal of the now deceased Dr. Matsumia, Kumonga was a type of very large spider to dwell in the jungle of Sogellel Island. However, exposure to the radioactive storm created by the UN's failed weather experiment transformed Kumonga into a 45-meter tall monster."
Of course, MUTO has not been confirmed by Warner Bros. at this time. Aaron Taylor-Johnson, Bryan Cranston and Elizabeth Olsen star in director Gareth Edwards reboot, which is currently in post-production.