A potential big deal, but it seems unlikely that the US would actually withdraw, even temporarily, from the Multinational Force and Observers (MFO) in Sinai. That being said, the MFO are in an increasingly precarious position with reports of attacks on or near their bases in Sinai (the MFO are extremely discreet, and I'm not sure such attacks have been acknowledged publicly). The chances Islamic State Sinai Province would target them are not negligible, if they haven't already, and some of the peacekeepers are requesting heavier weaponry. From AP's report:
Armed primarily with light weapons, armored personnel carriers and similarly limited materiel, the forces lack the capacity to take on Islamic State or other militants across the sparsely populated, desert territory. As a result, officials said, the Obama administration has been conducting an “inter-agency review” of the US posture in the Sinai.
The talks have included an examination of ways to bolster the safety of the Americans there, possibly by bringing in additional equipment to better secure positions, according to senior administration officials familiar with the discussions. But the debate also has encompassed the question of bringing the US peacekeepers home, said the officials, who weren’t authorized to speak publicly on the subject and demanded anonymity.
Although the Camp David Accords, which led to the Egypt-Israel peace treaty, legally mandate the presence of the two American military units, the US can remove them — at least temporarily — if they’re in imminent danger. Still, such action could have major political implications. One official said the US does not currently believe there is an imminent threat facing the peacekeepers.