For us, this is the biggest "missing piece" with Review Assistant.
We've been evaluating it for a few weeks now but unfortunately it doesn't fit the bill, as some of our reviewers won't have VS. Not sure why the "Planned" features are those so much lower down the list...

any updates on this Review board web interface for scrum masters?

A web interface would be very useful to our team. Our scrum masters and non visual studio devs currently have no visibility to the review process. Even as a dev performing the reviews I would prefer to not be confined to visual studio.

A web app would also be preferable to a desktop app since that would open the door to our team members running OSX and also allow linking to reviews from our project tool.

A stand alone application would be great as well, but browser embedded app would be preferable.

Desktop software is almost dead. And management doesn't necesserly run Windows.

A very simple web backend would be more useful to me than a very powerful features packed desktop client.

Review Assistant is great for VS users. But we have also JAVA / Eclipse users and SQL-Script programmers, that need to do reviews. A server / Web-based additional solution / extension would be great - as long as it supports those other languages well. Such a solution should also allow to review code that is not checked out locally.

That would be great.

But we have people working on different platforms, both Windows, Linux and Mac.
Will there be a client for anything other than Windows?

The browser solution will fit all platforms.

We consider creating the standalone desktop client from Review Assistant VS extension. This is the fastest way to allow working with Review Assistant without Visual Studio.

Will this solution fit you needs?

We have the need for a review tool that not only supports Visual Studio projects, but also Java projects (or even mixed ones). Not every reviewer in our company has all development environments installed and all sources locally on his machine so a Review Board version that works browser based would be a great solution for us. While the integration into Visual Studio is great, only supporting Visual Studio is not enough to use Review Assistant in our company.

At an organization I work for, there is a code review process that I believe could really be enhanced by this product. However, there are individuals such as managers or perhaps DBAs that are part of the review process that do not use visual studio. The code review tool that they do use allows them to review code without need of Visual Studio, however, I feel that the code review process would benefit greatly for those with visual studio with the integration your product provides. Until there is a way of participating in the code review process without Visual Studio, however, I will not be able to pitch this product to the organization.