فَتَرَى الَّذِينَ فِي قُلُوبِهِم مَّرَضٌ يُسَارِعُونَ فِيهِمْ يَقُولُونَ نَخْشَىٰ أَن تُصِيبَنَا دَائِرَةٌ
Now, you see those who have disease in their hearts race to-wards them saying, "We apprehend that some misfortune may overtake us."
It means that after hearing the religiously binding injunction of the abandonment of close friendships, people who have the disease of hypocricy in their hearts started racing towards their disbelieving friends saying that cutting off relationships with these people is dangerous for them.
Answering them, Almighty Allah said:
فَعَسَى اللَّـهُ أَن يَأْتِيَ بِالْفَتْحِ أَوْ أَمْرٍ مِّنْ عِندِهِ فَيُصْبِحُوا عَلَىٰ مَا أَسَرُّوا فِي أَنفُسِهِمْ نَادِمِي
So, it is likely that Allah may bring victory or a command from His own side, whereupon they become regretful over what they concealed in their hearts.
It means that these people are under the impression that the disbelievers and the Jews will overcome Muslims. But, Allah has decided that it will not happen. Rather, close is the conquest of Makkah. Or, even before the conquest of Makkah, Allah may, by exposing the hypocrisy of the hypocrites, put them to disgrace. Then, at that time, these people will regret thoughts they had concealed.