DisplayPort 1.2 MST (Daisy Chaining) on 2013 MacBook Pros

Hi,

If I am not wrong, 2013 MacBook Pros support DisplayPort 1.2, and according to Wikipedia one of the features added in 1.2 is daisy chaining (emphasis mine):

DisplayPort version 1.2 was approved on December 22, 2009. The most significant improvement of the new version is the doubling of the effective bandwidth to 17.28 Gbit/s in High Bit Rate 2 (HBR2) mode, which allows increased resolutions, higher refresh rates, and greater color depth. Other improvements include multiple independent video streams (daisy-chain connection with multiple monitors) called Multi-Stream Transport, facilities for stereoscopic 3D, increased AUX channel bandwidth (from 1 Mbit/s to 720 Mbit/s), more color spaces including xvYCC, scRGB and Adobe RGB 1998, and Global Time Code (GTC) for sub 1 µs audio/video synchronisation. Also Apple Inc.'s Mini DisplayPort connector, which is much smaller and designed for laptop computers and other small devices, is compatible with the new standard.

However, on OS X Mavericks, daisy chaining is only supported for Thunderbolt displays and not displays that support DisplayPort 1.2, such as Dell U2713H.

Is this a limitation of the hardware, or is this a feature that's not supported by Mavericks's DisplayPort drivers and could potentially be supported by Yosemite?

Thanks.