Of course we will be able to update from the beta to the final. Its just not intended by Microsoft. All what the Mango-Update-Tool does is that it "provisions" (changes...) the update-regkey on the phone to get the new update. Once the final is out we can switch back to the official branch.
Then the thing with "danger" etc...etc.. there is no real danger involved. The beta in fact is stable and pretty featurecomplete. About the waiver and risk aknowledgements...there are just the standard "void warranty" ones and that you should read the manual before flashing (which should be a MUST).
Then deploying: Only the interop-services were disabled. So we lost the direct registry access. File Explorer and every other homebrew app still works

So we only miss registry-editing (which still can be done with the provxml-trick on HTC or the MFG on LG).
Deploying is still possible if you have unlocked your device in nodo-state...
to make your htc phone to be able to unlock just copy this to windows dir and run htc connection setup:
<wap-provisioningdoc>
<!-- *** COMMENTO *** -->
<characteristic type="Registry">
<characteristic type="HKLM\Software\Microsoft\TaskHost">
<parm name="DehydrateOnPause" value="0" datatype="integer" />
</characteristic>
<characteristic type="HKLM\Comm\Security\LVMod">
<parm name="DeveloperUnlockState" value="1" datatype="integer" />
</characteristic>
<characteristic type="HKLM\Software\Microsoft\DeviceReg">
<parm name="PortalUrlProd" value="" datatype="string" />
<parm name="PortalUrlInt" value="" datatype="string" />
</characteristic>
<characteristic type="HKLM\Software\Microsoft\DeviceReg\Install">
<parm name="MaxUnsignedApp" value="2147483647" datatype="integer" />
</characteristic>
<characteristic type="HKLM\ControlPanel\Themes\1">
<parm name="ChromeColor" value="#AA000000" datatype="string" />
</characteristic>
</characteristic>
</wap-provisioningdoc>
including semi-transparent bars and dehydrate-hack (which still works

)