The Office of Tax Simplification has released its initial report into what is often called "The Son of IR35".
http://www.hm-treasury.gov.uk/d/ots_small_business_interim_report.pdf
The findings seem to recommend to either scrap IR35 or keep it and police it better. Amendments and the possible merger of PAYE and NIC's are also cited as providing an opportunity to make the taxation of small businesses fairer.
In summary what they say about IR35 is: