It’s official. Google’s +1 button for websites will be coming tomorrow. A launch partner accidentally tipped the news of the release to TechCrunch, and Google’s since confirmed with me that it will be happening.

UPDATE: See our new post about the actual launch of +1 buttons: It’s Here: Google +1 Buttons For Websites.

Google tells me that any site will be able to to add the +1 button code to their site as of tomorrow, through a self-serve process. The company says a full blog post and more details will be posted tomorrow.

My previous post from earlier this month, Just Weeks Away, A Preview Of The Google +1 Button For Websites, gives a pretty good idea of what to expect in terms of implementing the button. You can expect a self-serve form like this:

If you’re registered with Google Webmaster Central, you’ll have access to button-push analytics, similar to this:

It remains unclear if the buttons will in turn link to any broader social sharing on Google itself. Right now, the only way those within your social network on Google will see what you’ve +1’d is if you have effectively created a fresh network just for this, deliberately chosen to expose your +1 activity, and if you’re friends know exactly where to look to see this.

That’s a far cry from the ease that people can share what they like on Facebook with friends, to me a key factor in the success of the Facebook Like button. My previous post, Has Facebook Become The Master Key To Unlocking The Web?, goes into more depth about this and the challenge Google faces competing with that system.

In somewhat related news, Twitter has just released a “Follow” button for web sites, which allows people to easily follow a site rather that just tweeting articles from it.