i heard that government is going to provide nephew visa, in addition to the current provision for husband visa, wife visa, son visa, daughter visa, boyfreind visa, girlfreind visa, brother-in-law visa, sister-in-law visa...and so many other...

My dear as per my knowledge, only the following types of visas are available in Qatar.

1 Tourist Visa
2 Business Visa
3 GCC Residents Visa
4 Visa for the Companions of GCC Nationals
5 Work Visit Visa
6 Family visit Visa
7 Multiple-entry Business Visa
8 Working Visa valid for one year and more
9 Resident Work Visa
10 Resident Visa (for families)
11 Visas for newborns

You can visit the following web page for detailed information;
http://www.qnaol.net/QNAEn/Qatar_Portal/Visa_Residency/Pages/TypesofVisa...