I got some files for testing. It´s the same (MTS), like the SONY TD10 - nowadays, because they will put on further formats, when the Cam will be released in (what they say now...) December 2011.
I droped them into VEGAS PRO 10e - timeline. Great... IT WORKS...
Just to state, in case you don't know, but you can stick the TD-10 MTS files on the Vegas 10e timeline too. However, they do not work perfectly as you might be dreaming today that they do. If the Panasonic memory is formatted as FAT32 ( like the TD-10 ) then those MTS files will be size limited and need to be stitched together to form a single contiguous file for editing. This is why with the Sony TD10 you need to use PMB. Sure you could manually stitch the files together and resync the audio which is quite a chore but PMB is easier. I've done it so I know. I suspect that the Panasonic will be including some sort of software or in camera firmware processing to get those MTS files ready for use in Sony editing.
Your test of the Panasonic MTS in Vegas is an excellent indicator of compatibility, but it is not the complete story. You should hope that Panasonic will complete the compatibility process and create their own software that emulates what PMB does so you will not be caught in a quagmire of conversion nonsense like the owners of JVC have to do. Learn from the JVC owners and do not buy any brand camcorder unless you know there is a complete work flow solution for your video to distribution, that currently only Sony offers.
BTW- 2D Canon HD camcorders have the same problem with the FAT32 formatted storage and they have a software that makes their file structure compatible with Vegas and Mac based editing. I know this as I bought a Canon for my daughter and it came with the needed software. I bought her the Canon ( as opposed to the Sony) because it had this Mac compatibility with iMovie as she owns a Mac.