Thanks again @batyanko
Today, I can confirm that the 2570p's that I saw were all socketed.
I used HP PartSurfer to view all the components of a specific 2570p device. Using the serial number of the laptop and the country it originally came with, I was provided with a tabular list of all the laptop's components along with their part numbers. These part numbers can be googled and can be used as a reference when ordering part replacement from HP.
Anyway, using the HP PartSurfer, I confirm that the laptop has a socketed CPU (system board part number 685404-001) and it also list that the board is fitted with an i5 3320M cpu which also answers my question of wether the 3320m was soldered or not. The 3320M (681952-001 part number) can be ordered and therefore, can be removed and be replaced by a new one so it is not soldered.
Another thing, it also has Broadcom Model: BCM943228HM4L which is compatible with El Capitan if ever I decide to make a hackintosh out of it. Neat!
I'll purchase an Elitebook tomorrow.