What caused MS to remove Timeline management from WMM?

Why drop function that is very much needed and it already existant?

Are we going to get it back in Win/8?

At the top of this BLOG a statement indicates one can get back old functions:

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But for these more advanced users of Windows Movie Maker, there's now some good news: the 2.6 version of Windows Movie Maker is available for download now – and it even works on Windows 7 Beta! If you want to get this older version back, you can do so: just follow the link below:

http://www.microsoft.com/downloads/details.aspx?FamilyID=D6BA5972-328E-4DF7-8F9D-068FC0F80CFC&displaylang=en

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However when I tried to getn V 2.6 it told me that it is for VISTA. What is

that statement telling me?