Firefox 4 Beta 8 has been released and available for download through its FTP servers, currently Firefox 4 Beta 8 being distributed to mirrors once distribution is completed you can able to view the official announcement from Mozilla on their blog and able to download from Firefox site.
As Firefox 4 Beta 7 is feature freeze build, there will be no major features added to Firefox 4 after that as is the case with Firefox 4 Beta 8 also.
Firefox 4 Beta 8 is more of bug fixing and more polished one when compared to Beta 7. We can safely assume and say Firefox 4 final not coming this year. There are still two betas to follow after this.