This is an update to the Arex PocketMX [1] as reported back in April.
Improvements include:
-3.5" screen (previous model was 2.5")
-Lithium-Ion battery (previous model was AA)
RWC Corporation will release the "Arex PocketMX typeP" portable MPEG-4 player supporting the playback of DivX on July 10th. The price is Open Price. The estimated retail price is around 29,800 yen.
This is the successor to the Arex PocketMX typeH [2] released in May. The LCD display has been increased from 2.5" to 3.5", and the battery has changed from 4x AA to a rechargable Lithium Ion. The playback time is about 4 hours, and when playing MP3s, 6 hours. The OSD has also been changed to Japanese.
The resolution of the display is 480 x 234 dots. Recordable media support is SD Memory Card/MMC, and the playback of DivX, XviD movies, as well as JPEG, and MP3 files is supported. The maximum supported playback resolution is 352 x 288 dots at 30fps, with a 768kbps bitrate.
A recharging cradle supporting the USB Storage class is also included, and the cradle features a video output port. Its design features an integrated protective cover and stand. The external dimensions and weight are 103 x 22.4 x 94mm (W x D x H) and 200g (no batteries).

Inspired by:
http://www.watch.impress.co.jp/av/docs/20040608/rwc.htm [3]
News Release:
http://www.rwc.co.jp/release/mx_typep.html [4]
Arex PocketMX typeH (TechJapan article):
http://www.techjapan.com/modules.php?op=modload&name=News&file=article&sid=215 [5]