Thanks for your response William.
It was more the second scenario I was referring to, but to clarify.
Content from mywebsite.com would be moved to mywebsite.com/new-url, with 301 redirect added to mywebsite.com
New content would be added to mywebsite.com
Thanks for your clarification that bots would henceforth ignore mywebsite.com; naturally this is really not what I want.
So, really just wondering if there is an effective alternative I can use. As mentioned, the current home page is ranking well, but the redesign necessarily involves removing the current content.
Essentially I'm looking for a way to preserve rankings...
Thanks, Matt.