Happy to answer any questions about this, it is particularly cool because you really can run a SaaS service with "no servers" and still get to use your pick of providers (Sendgrid, Mailchimp, Twilio, etc.). It seems like a lot of fun, especially paired with Angular.js.
As a person who have replicated Zapier kind of integration into our development tool, I don't find this news anything bug a paid advertisement. Anything with REST API can be integrated with Zapier, so Firebase can be integrated too. Looks silly to me.