Amps, preamps, stompboxes, speaker cabinets, mics, effects... all modeled on famous vintage hardwares used by reknowed guitarists and bassists.
Extract from the text : "AmpliTube 3 contains over 160 pieces of gear including models from the most sought-after vintage collections and modern day workhorses. You'll get 51 individual stompboxes and effects, 31 amplifier preamp & power sections, 46 speaker cabinet models, 15 high end stage and studio mics, and 17 post amp rack effects. Plus, with the AmpliTube 3 open architecture, you can add more packages as you need them."
Why is KVR sending notification that Amplitude has a "new version" (v3.1.4) as of today (2015-04-02). Version 3.1.4 was released on 2014-07-17. According to the IKM website, v3.1.4 is the latest version.
Just to inform you, there is a free new update for AmpliTube in your the User Area -> My Products section (https://www.ikmultimedia.com/userarea/) of your IK Multimedia account. Make sure to download this and check out the new AmpliTube 4.6 version's general reliability improvements and integration for iRig Stomp I/O.