I'd like you to place a bigger bet on JQuery. I'd like eazy support for working with model data... such as $.mvc.model.firstname and $.mvs.controller.action(params).

Allow a view to manipulate anonymous models like new View(new {Name="John", Age=20}) and in cshtml file can access this properties like @Model.Age @Model.Name

for <a href=.....><img src=...... />xxxxx</a>

MVC4 has a great potential for developing RIA applications..
I know that jQuery is most popular js framework and it has a lot of plugins but wouldn't it be a cool thing to have one unified framework for most things (look at dojo uis)?

So my suggestion is to add support for dojo toolkit, and create special helpers, validators, etc.
It shouldn't be hard, cause dojo supports html5 params and with that it's even easier to add unobtrusive validation than in jQuery.. just parse page and it magically works!

What do you think about that?

Render a partial view to a string to send back to an ajax request

Don't do the Ajax grid. There's a bazillion of them out there. You're wasting your time. Further, challenge what MVC's mission is and why it has been adopted as widely. Small and tight. Helper functions, YES - controls - NO. Use and/or contribute to jQuery UI. The world does not need yet another damnable grid.

It would be great if razor views could support generic models.

@model MyViewModel<T>

So basically just something like Bootstrap from Twitter. A collection of CSS (preferably LESS) and JS to create a GUI in the style of the Metro GUI on the desktop/mobile. A lot of Microsoft website already embrace the Metro-style, but there is no uniform standard or library available for others who would like to create a Metro-website. I think this is a very good chance for Microsoft.

ASP.NET MVC 3 before, JsonResult use JavaScriptSerializer, JavaScriptSerializer have "Date" format problem.

ASP.NET Web API use Json.Net, the ASP.NET MVC 4 can use Json.Net by JsonResult?

Right now there are a number of difficulties in getting selectlists / dropdowns to simply work right. It's just not intuitive. The top two most-voted issues on CodePlex are both related:

http://aspnet.codeplex.com/workitem/7629
http://aspnet.codeplex.com/workitem/4932

Posted on 8/15/2011 at 5:17PM you can find a comment on the first of the above two desribing the pains and my suggested fix. I hope that's helpful.

You can also find ample instances of users having issues with selectlists on the MVC forums (on www.asp.net) and StackOverflow.

Sometimes you need to build interstates and sometimes you need to fix potholes. Please fix this pothole! :)

Very useful and used in many OSS/commercial projects, but annoyed copy code from project to project

Support for friction-free of some sort of architecture based on multiproject Areas, so large scale sites with many contributors could be managed in a better manner.

dding multi-tenancy to an MVC app is a huge pain in the rear, and it would be nice to see some kind of hooks to make this simpler.

will be cool if u will add new helper something like this: Html.Css("1.css", "1.css", "1.css")
1. helper will take params
2. in the end of file will add: ?v={Assembly version}, it will help to avoiding of cache in development stage