Imangi Studios has just announced that their latest release, Temple Run [App Store] — the endless runner that makes you feel like an archaeologist with a penchant for deadly situations — is free, for a limited time.

Temple Run scored 4.5 stars in our recent review and was among the titles in our Best iOS Games of August 2011 roundup. Imangi recently pushed out a v1.2 update that brings the following enhancements:

• Two new characters
  • Scarlett Fox
  • Montana Smith
• Two new powerups
  • Boost (when you pick it up you boost forward at super speed)
  • Head Start (when activated you boost forward 1000m at start of your run)
• Three new achievements
  • Miser
  • Allergic to Gold
  • Head Start

With this updated, players can now earn free coins through offers in the in-game store, but Imangi would remind players that such in-app purchases are optional, and that coins can still be earned in-game.

The next Temple Run update, bringing more new characters and powerups as well as iCade support, is expected soon.