As others have said, a little patience is needed - for one thing Microsoft will be busy integrating the business side of things in the background.
It's likely (and this would be my hope) that Skype will be integrated into the WP experience. So, rather than a Skype app that is seperate from the main phone feature of WP, they'll be integrated together, so when you place a call you'll be able to make it using your cellular connection, or place the call via Skype.
Skype also has IM-style capabilities, and it remains to be seen whether this (and the other Skype features) will be kept seperate from, or integrated with Windows Live Messenger over time.
The idea of having Skype's features integrated with Windows Phone is exciting for the platform, and will offer a better experience than what an app could acheive alone. From day one WP has been about more than just apps, so it shouldn't surprise anyone if Microsoft's strategy with Skype when it comes to WP is to do some deep integration.
Looked at from another angle though, doing deep integration with Skype is something that most likely would be part of a future WP update - but, where does that fit into the schedule? The Tango update is set to be a minor one, and the next major update is rumoured to be Apollo, which is most probably going to drop 2H 2012. We know little of what end-user functionality might be included here. Skype could be a part of it - but that means it could be a long way off before we see Skype for WP7.
It's always possible a Skype app might get released as a stopgap measure, and even without a WP update, some basic integration could still be done via the online parts of Windows Live, which act as a gateway of sorts for the other online services you use. Time will tell - patience is a virtue!