It's the Artisan - a rolled aluminum arm tube, gimbal bearing, adjustable VTA and azimuth with magnesium headshell. It's due to be launched in May. I've been working with Thom evaluating a pre-production sample.
I heard the Teres 255 in Colorado and I rate the Galibier motor controller ahead of the Teres. You get better dynamic attack, tighter, extended bass and very little surface noise intrusion.
The Artisan seems to do pretty well with most carts. I've only tried it with a Dyna XX-2 (excellent), Koetsu Black and an Empire EDR.9 (very enjoyable). I believe Thom has been very pleased with his trials with a 103R and a Dyna 20X. I would describe it as very honest, in that it doesn't flatter or apologize for the limitations of the cart or table.
The OL Silver is a good arm, it's very dynamic with lashings of fast bass, however like many cast aluminum arms, it has a slight HF tizziness, lacks subtlety and has a slightly gray tonal coloration. The Artisan is more neutral and has superior micro dynamics - you don't just feel the power of the performance but also the emotion. Thom has described the Artisan as being close to the Triplanar in character.
My personal experience confirms that you should buy the best table you can afford, then the best arm and use whatever's left of your budget for the cart (assuming you already have a good phono stage and RCM).
The Serac/Artisan combo will be a giant killing combo (it will beat the Raven One which retails at $5k) and I would suggest either the Empire EDR.9 ($160) or Dyna 20X ($650) would be great companions. The Dyna XX-2 is stunningly enjoyable, but at $1750 it might be an indulgence.