Pakhtuns of Balochistan have not demanded separate province on organized platform. There is also no active movement for South Pakhtunkhwa Province. Nevertheless, they demand more rights, autonomy, jobs, funds etc and they insist for equal status on all resources, Provincial Assembly seats. Only nationalist party of Pakhtuns in Balochistan i.e. Pakhtunkhwa Milli Awami Party led by Mehmud Khan Achakzai demands equal status not separate province.
Piece of information which is quoted in Wikipedia is totally misleading and fake. Following is the text which the authore has posted in wikipedia.
Quetta (
Pashto:
کوټه ) is a
district in the north-west of
Balochistan province of
Pakistan.
It is part of the greater Pashtoonkhwa and therefore, now called as South Pashtoonkhwa. It was part of
Quetta Division until the year 2000 when divisions were abolished. The district is famous for its agriculture produce, most notably fruit orchards but also including apples and grapes. The
Hanna Valley is an area where almonds are grown. The population in 2008 was estimated to be 1.14 million
[1]
Above text is quoted from the following link.
[1]
http://www.dawn.com/weekly/herald/herald87.htm
Underlined text in paragraph is personal view of the author and doesn’t represent the view point of majority of Pakhtuns.
I have edited that disputed text from the paragraph. Everyone can edit it, so Wikipedia is not authentic sources. 
Quetta (
Pashto:
کوټه ) is a
district in the north-west of
Balochistan province of
Pakistan.It was part of
Quetta Division until the year 2000 when divisions were abolished. The district is famous for its agriculture produce, most notably fruit orchards but also including apples and grapes. The
Hanna Valley is an area where almonds are grown. The population in 2008 was estimated to be 1.14 million
[1]
Following link is another article about Quetta.
http://en.wikipedia.org/wiki/Quetta