Wow i am.... NOT impressed. Has Tekkit died because of the first FTB Launcher release? I don't think so, they are still alive and provide a service to their users. Some might move to Tekkit, so be it. We will survive and carry on anyways and won't shed a tear about some users switching to other systems. And those mods are as you said only available as beta.1.6 mods have been available at Tekkit for 14 days now, it just requires that you change setting in the launcher to use beta, so if FTB don't want a lot of people to go there, they need to get something out soon. 1.7 is around the corner and a lot of the mods are already done for 1.6.4, and people are not that loyal to a brand if they can get their needs fulfilled somewhere else.
Even MultiMC 5 hasn't released a beta version (just unstable alphas). Now you expect us to work day and night on just FTB and nothing else or what?
And 1.7 isn't around the corner. Is has been said that MCP and Forge might need 4-8 weeks till they have a stable base for modders to start. Of course some will work with broken APIs but most not. And the core mods in our packs take roughly 1 month after a stable Forge is available till they have an update for the new MC version.
1.6.4 will probably stay alive a long time in the modding community like 1.2.5 did.