HTML5 > HTML4 ?
What are all the things that designers need to considered on HTML5? How can we start HTML5?
you need to define what html5 are you talking about. The buzz word HTML5 or the HTML5 Standard. Those two things are completely two different pair of shoes.
1. Will HTML5 the future?
Not only the future it is today too. HTML5 Standard what i'm talking about is made to have the most support even for old browsers too. Some features will only be available in higher browser version but it can be use now.
2. Will HTML4 kill Flash?
3. HTML5 in SharePoint 2010?
You should check out the following Posts:
How can we start?
Or check out one of my first blog post http://www.n8d.at/blog/general/html-5-rocks-where-to-find-information/