Those are indeed the all new Brainwavz M4 in all of their glory! With an open vented housing, S400 tips and all new cable design these are looking very nice. Judging from pictures they look like they're well built, the stress relief looks rather thick for instance. As for what they sound like, here's a quote from an admin on mp4nations forum Quote: Essentially what we're looking at is a more bass oriented B2! I'm very excited for these. After reviewing the Beta with excellent impressions left on me, these will be top priority for me! I received my M4 today and wanted to post some information for those interested: Specifications Drivers: 10mm Newdymium Impedance: 16 ohms Frequency Range: 20hz-20k Sensitivity: 101 dB at 1mW Rated Input Power: 4 mW Maximum Input Power: 20 mW Accessories 3 Silicon Tips (S/M/L) 1 Pair of Comply S series tips 1 Shirt Clip 1 Hard carrying case Brainwavz also notes that the M4 will benefit from amping and will retail for $70 and for $80 with a microphone. I am in the process of burning them in now and will be working on a review soon!