Usually google recommends 301 for domain move. Already both domains are live, and on top for search queries. At this point, its not better to apply 301 redirect.
Content will be the most important thing, just like now. Compelling content and social media signals together perform well. Google may increase the value of website speed & SSL factors.
Mobile is the future of Internet. No one can ignore the traffic from mobile devices. Without a mobile friendly website, we may lose potential customers.
I have read the news few weeks back in search engine roundtable. Nice to see the same here.