Native Skype client will be released this week.
This is what we know about it:
1. App will be offered as free download
2. Skype to Skype calls over wifi will be free
3. Skype to landline calls over wifie will 2c
4. You will not be able to make calls over 3G, but like Fring which had the same limitation we are sure hackers will have a solution.
We will keep you posted when we get more details.