So I decided that we could use an unofficial 0.5.6.3u build to hold us over until the epic release 0.6. What I did was take the 0.5.6 source and starting adding in code from the 0.6 development branch that did not modify the netcode or odamex.wad in any way.
Here is a changelog. Despite not being an official release, some of these changes ripped from 0.6-dev are pretty awesome!
Fixed: Spynext shaking as a result of EarthQuake accidently being called. (r2602 & r2655)
Fixed: Angle calculation errors with co_silentrespawns. (r2613, r2614, and r2615)
Fixed: An issue with the player's view jumping when changing resolutions (r2619)
Added: hud_scaletext. Scale with a factor of 1 - 5 (1 being original size). Default is 2. (2621)
Fixed: Some CTF scoreboard numbers being overwritten. (r2629)
Fixed: Console asliases could not contain any uppercase letters. (r2638)
Added: Enhanced ZDoom mouse option. With this option, you can import settings from ZDoom. It will even automatically scale ZDoom and Doom settings to and from each other. (r2649, r2650, r2694, r2695, and r2750)
Modified: "Game is full" now only displays when the player tries to join a full game. Also "Press USE to join" no longer displays when the game is full. (r2654)
Fixed: Prevent client segfaults from occuring when the client does not receive the message to spawn its player object until after the start of the level. (r2662)
Added: The bind for Turn180. (r2666)
Fixed: DEHACKED patch height (r2782)
Fixed: Picking up a flag should have the brief yellow screen flash, like picking up other Doom items. (2788)
Added: A HUD timer on the fullscreen HUD
==========Updated for 0.5.6.2u==========
Fixed: Scale the printing of target names on the screen according to hud_scaletext. (r2802)
Fixed: Scale the printing of the 'Press USE to join' overlay message according to hud_scaletext. (r2803)
==========Updated for 0.5.6.3u==========
Modified: Missed some important mouse code that dr_sean pointed out. (r2712)
Modified: sv_ticbuffer is now defauled to 1 on the server. (r2815)
Added: kpup, down, left, right, and enter can be bound now. (r2820)
Modified: co_allowdropoff is supposed to always be disabled for vanilla demos. (r2828)
All of these changes *should* be compatible for playing on 0.5.6 servers. Remember this build is NOT endorsed by the odamex team and is NOT official. This product includes NO warranty etc.
Update Zip - For those that want to do a quickie install over 0.5.6.
Full install - The big package for those of you who that have yet to install Odamex. This build even contains a small update to odamex.wad, updated flag pole sprites! Also note this build comes bundled with Doomseeker.