The Sony PMWPZ1 Player for 4K content is shipping now.
   

The PMW-PZ1 4K SxS memory player is a high-quality and cost-effective playback solution for 4K shooting and post production applications. The PMW-PZ1 features multi-format playback capability for 4K (including 59.94p, 50p, 29.97p, 25p, 23.98p and 24p*), QFHD and HD, supporting a wide variety of formats. These include XAVC Intra and XAVC Long, XAVC S-Long*, MPEG HD422* and MPEG HD*.

The PMW-PZ1 is equipped with an SxS card slot, a HDMI output, 3G/HD-SDI outputs (x4), an audio output, LCD color monitor and more. This combination of versatile interfaces enables seamless playback, copying and monitoring of 4K and HD video across a diverse range of applications, from location shoots to post production to video walls. * Requires firmware upgrade (planned for 3Q 2015)

Multi-format capability in 4K and HD Highly flexible multi-format playback capability for 4K and HD. It can playback a variety of formats including XAVC Intra, XAVC Long, XAVC S-Long*, MPEG HD422* and MPEG HD*. * Requires firmware upgrade (planned for 3Q 2015).

Simple copy and back-up process USB interface for connection to an external USB storage device, enables users to copy data in SxS media directly to external storage without the need for other devices. A copy log* (csv format) helps users easily check the file names of copied files. * Requires firmware upgrade (planned for 3Q 2015).