Here are the answers to your questions regarding the Intel® Solid-State Drive 750 Series 1.2 TB:
1. Is there some other connector that will have the same profile of a standard M.2 SSD?
The answer to this one is 'no' because this SSD does not come with a M.2 form factor.
The form factors available for this drive are 8639 - Compatible connector and Add-in Card (AIC) Form Factor.
Please check this link for additional information:
2 - If my M.2 slot has only 2 PCIe lanes does that mean that I will only see one half of the performance on this drive?
The performance will be less proximately ½
For further details on this matter, please contact your motherboard manufacturer.