A developer in the Android community over at XDA has taken the leaked RUU for Honeycomb for the HTC and created a Custom Honeycomb ROM for the HTC Flyer. His name for the custom, flashable ROM was ridiculously perfect, and came together all by itself. You gotta love the "FlyHoney"!

Here is a list of features and a download link. We've also included a link to the instructions, as they are a bit in-depth and come with a big warning.
FlyHoney ROM - Features:
  • ROM base: HTC_WWE_3.10.405.156 (BETA) --> Android 3.2 Honeycomb
  • deodexed
  • nano
  • sysro/sysrw
  • rooted
  • busybox
  • The Partitions are being formatted with alignment (Like the zipalign for apks)
  • Enabled phone function (not fully working yet)
  • SD card speedfix
  • Bluetooth headset profile enabled
  • Enabled hardware rendering
  • longer wifi scan interval -> better for battery if wifi is on but not connected
  • unsecured boot image (for root commands via adb shell)
  • big VM Heapsize
  • Battery with percentage
  • Smoother UI
  • all apk's zipaligned
  • sqlite3
  • init.d scripts support
  • zipalign all apk's you installed on boot
  • no annyoing bootsound
  • Ad-Free
  • ES File Explorer
  • Titanium Backup
  • Other hacks and mods..

Removed:
  • HTC Feedback
  • Google Feedback
  • KidMode

Make sure you follow the instructions carefully before proceeding with this ROM flash! Here is a link to the instructions.
ROM Download link: FlyHoney Download

Source: FlyerForums.net via an.droid-life and XDA