Interesting...to begin with, the NUP was kind of an outsider group in the FFC. It supported early elections while TMC-FFC negotiations were going on, and its involvement always seemed to begin and end with its agreement on the Declaration of Freedom and Change...
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In short, the NUP criticized the Juba Negotiations, decrying them as partisan, criticizing the FFC for lacking a vision for peace, and the rebels' "extreme" demands. They also condemned the lack of a parliament and the delay of the economic conference.
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Additionally, the NUP also called for elections to be officially scheduled. It's important to note that - while statistics for this are unavailable - it's widely believed that the NUP is the largest political party in Sudan. It has a lot to gain from elections.

Overall, this statement is in line with the NUP's usual political strategy, which consists of shifting its stances to capitalize on popular dissatisfaction while keeping an eye on elections. This is what happened when Sadig al-Mahdi switched from criticizing the revolution as...

...opportunist and signed the Declaration of Freedom and Change. This is what they tried to do when they distanced themselves from the FFC and began taking the military's side, hoping to see early elections. And it's what they're doing now, regurgitating popular FFC criticisms...

...and making another shot for government seats. It should be noted that, as an FFC signatory, they are guaranteed a spot in parliament once it forms.

This isn't to say all their demands or criticisms are wrong, though. However, I doubt this'll have an impact.
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