Partyforumseasia does not like fortune-telling but the political timeline for the last few weeks looks a bit like indicating a surprise solution:

Mid July
Royal Pardon for Sam Rainsy at the request of PM Hun Sen “in a spirit of reconciliation”

19th July
Triumphant return of Sam Rainsy after four years in exile to avoid imprisonment after a dubious sentence he calls politically motivated

28th July
Election results with heavy losses for the ruling CPP and significant gains for the opposition under Sam Rainsy: 68 seats CPP – 55 seats CNRP

29th July
Press conference of Sam Rainsy: “We are asking for this (investigation into alleged massive irregularities) not to bargain for positions in the government”
(Source: Straits times Indochina Bureau Chief Nirmal Gosh, who continues: “He (Sam Rainsy) said it was “premature” to talk about power sharing in the new government.”)

31st July
PM Hun Sen: “The Cambodian People’s Party has an open heart to talk to the CNRP” Background: The CPP has not enough seats to convene parliament and needs the CNRP’s cooperation…

Soon???
– A grand coalition between CPP and CNRP in the national interest of the country?
– Sam Rainsy finance minister? or better Foreign Minister?
Partyforumseasia: Probably not a bad solution for Cambodia!