Are there any Alloy MVC Template for 7.5 anywhere availible for download?
You can choose to install a MVC demo site in one of the last dialogs when setting up a new site with the latest version of deploymentcenter.
Thanks Per! I didn't even look in the deploymentcenter, stupid me :)
Are there any demo template(s) with bootstrap 3?
Nothing that is released publicly from EPiServer. The Commerce team has upgraded their sample package for Web Forms but this has not been released yet and the CMS package has not been upgraded yet.