They're working on an 802.11n draft wireless add on upgrade too....
There is no need for anything more than 100Mbps network... it's a media streaming device and for the forseeable future there is no media available that requires more than 100Mb, so why fit a more expensive 1000Mb NIC when it's totally not required?
My unit plays 1080p MKV files over the wired LAN without issue too, the standard firmware is flaky to say the least, but get the Beta ones (which won't ruin your warranty) and it's a much improved device.
It's a much, much better device than a PS3 as it's designed as a media server and not a games console (i have access to both) and can handle MKV etc, it also allows DTS/Dolby Digital pass through etc which i don't believe the PS3 can at the moment?
With regard to the media indexing, it can be a bit of a pain if you have just downloaded a file and have to watch it at that time.... i tend to copy the file to a USB flash drive and plug that in, that then takes less than a minute to scan and index... otherwise i copy the files to my NAS and set the system to reindex overnight, thus it's very rarely out of date.
From trying many of these devices in various places, it was the best i can find and it has a very active support forum and upgrade/update process, which few of the other systems do.
I highly recommend it!